Is It OK To Water Plants In The Heat Of The Day? Posted on May 28, 2022 By Amy Kaplan No Comments on Is It OK To Water Plants In The Heat Of The Day? FAQ How do I water my garden in hot weather? Time your watering for the morning or late afternoon. Water well and water deeply. Use drip irrigation or soaker hoses. Promote high humidity. Shield heat-sensitive plants from excessive sun. Don't fertilize during a heat wave. Keep as much moisture in the ground as possible.